Color-photographic recording material

ABSTRACT

A color-photographic recording material which, in at least one light-sensitive silver halide emulsion layer, an interlayer and/or a protective layer, contains at least one polyalkylpiperidine compound of the formula I ##STR1## as a light stabilizer. Color images obtained by imagewise exposure and development of this color-photographic recording material display good stability to the action of visible and ultra-violet light. 
     With respect to the definitions of the substituents and symbols in formula I, reference is made to the specification.

The present invention relates to a colour-photographic recording material which, in at least one light-sensitive silver halide emulsion layer and/or in at least one of the conventional auxiliary layers, contains at least one polyalkylpiperidine light-stabiliser.

In European Patent Application No. 11,051, a colour-photographic recording material has already been described, which contains a polyalkylpiperidine light-stabiliser in order to improve the lightfastness of the colour images obtained with this material and to suppress undesired fogging.

It has now been found that, surprisingly, an even better light-stabilising effect can be achieved when the compounds of the formula I, described below, are incorporated into the colour-photographic recording material.

The present application therefore relates to a colour-photographic recording material which, in at least one light-sensitive silver halide emulsion layer, an interlayer and/or a protective layer, contains at least one polyalkylpiperidine compound as a light stabiliser, wherein the polyalkylpiperidine compound is of the formula I ##STR2## in which R₁ and R₃ independently of one another are hydrogen or methyl, R₂ is hydroxyl, C₁ -C₁₂ -alkyl, C₃ -C₁₂ -alkenyl, C₃ -C₄ -alkynyl, 2-hydroxyethyl, C₂ -C₁₁ -alkoxyalkyl, C₇ -C₁₄ -aralkyl or a group of the formula --(CH₂)_(p) --CH(R₆)--X₁ or --CH(R₆)--X₂, in which p is one of the numbers 1, 2 or 3, X₁ is halogen, cyano, --OR₇, --OC(O)R₇, --OC(O)N(R₇)(R₈), --C(O)OR₇ or --C(O)N(R₇)(R₈), X₂ is halogen, cyano, 1,2-epoxyethyl, --C(O)OR₇ or --C(O)N(R₇)(R₈) and R₆ is hydrogen, methyl or phenyl, R₇ being hydrogen, C₁ -C₁₂ -alkyl, C₂ -C₁₂ -alkenyl, C₃ -C₁₂ -cycloalkyl, phenyl, C₇ -C₁₄ -alkaryl or C₇ -C₁₄ -aralkyl and R₈ being hydrogen or C₁ -C₄ -alkyl, or R₇ and R₈, together with the nitrogen atom to which they are bonded, forming a 5-membered or 6-membered heterocyclic ring, or R₂ is a group of the formula II

    L--CO--                                                    (II)

in which L is hydrogen, C₁ -C₁₂ -alkyl, C₂ -C₁₂ -alkenyl, C₃ -C₄ -alkynyl, C₃ -C₁₂ -cycloalkyl, C₇ -C₁₄ -alkaryl, C₇ -C₁₄ -aralkyl, chloromethyl, unsubstituted phenyl, phenyl which is substituted by two C₁ -C₄ -alkyls and one hydroxyl, or a group --OR₉, in which R₉ is C₁ -C₁₂ -alkyl, cyclohexyl, C₂ -C₁₂ -alkenyl, benzyl or phenyl, or L is a group of the formula III ##STR3## or R₂ is a group of the formula IV ##STR4## in which R₁₀ and R₁₁ independently of one another are C₁ -C₁₂ -alkyl, C₃ -C₁₂ -alkenyl, C₃ -C₁₂ -cycloalkyl, phenyl, C₇ -C₁₄ -alkaryl or C₇ -C₁₄ -aralkyl and R₁₁ additionally can also be hydrogen, or R₂ is a group of the formula V ##STR5## in which A' is methylene or a group --CH₂ --CH(R₁₃)-- and q is zero or 1, and R₁₂ and R₁₃ independently of one another are hydrogen, methyl, ethyl, phenoxymethyl or phenyl, or R₂ is a group of the formula VI ##STR6## in which B is a group C_(r) H_(2r), in which r is a number from 2 to 12, or is C₄ -C₈ -alkenylene, C₄ -C₈ -alkynylene, phenylene, xylylene, bitolylene, C₅ -C₁₂ -cycloalkylene or a group --CONH--B₁ --NHCO--, in which B₁ is a group C_(r) H_(2r), phenylene, naphthylene, tolylene or a group of the formulae ##STR7## in which R' is hydrogen, methyl or ethyl, R" is hydrogen or methyl and r is as defined above, or R₂ is one of the groups --S(O)_(z) R₁₄ or --OR₁₅, in which z is the number 1 or 2, R₁₄ is C₁ -C₁₂ -alkyl, C₇ -C₁₄ -alkaryl or phenyl and R₁₅ is C₁ -C₁₂ -alkyl, C₃ -C₁₂ -alkenyl, C₇ -C₁₄ -aralkyl or a group of the formula L'--CO--, in which L' is as defined above for L, R₄ and R₅ independently of one another are C₁ -C₁₂ -alkyl, C₃ -C₁₂ -cycloalkyl, C₇ -C₁₄ -aralkyl, C₇ -C₁₄ alkaryl or phenyl and R₄ can additionally also be hydrogen or a group of the formula Ia ##STR8## in which R₁, R₂, R₃, R₅, A, Y, m and n are as defined and M is a direct bond, ##STR9## and D₁ and D₂ independently of one another are hydrogen, C₁ -C₁₈ -alkyl, alkyl interrupted by 1 to 3 --S-- or phenyl, or D₁ and D₂, together with the C atom linking them, form a 5-membered or 6-membered aliphatic ring and D₃ is hydrogen, C₁ -C₁₈ -alkyl or phenyl, Y is --O-- or --N(R₁₆)--, in which R₁₆ is hydrogen, C₁ -C₁₈ -alkyl, C₃ -C₁₂ -alkenyl, C₃ -C₁₂ -cycloalkyl, phenyl, C₇ -C₁₄ -alkaryl, C₇ -C₁₄ -aralkyl, C₃ -C₁₁ -alkoxyalkyl, a group of the formula VII ##STR10## or a group --Z--D, in which Z is a --(CH₂)_(s) group unsubstituted or substituted by a methyl group, s being one of the numbers 2 to 4 and D being hydroxyl, --OR₁₇ or --N(R₁₈)(R₁₉), in which R₁₇ and R₁₈ are hydrogen, C₁ -C₁₂ -alkyl, C₃ -C₁₂ -cycloalkyl or a group of the formula VIII ##STR11## and R₁₇ additionally can also be a group of the formula VII, R₁₉ is hydrogen, C₁ -C₁₂ -alkyl, C₃ -C₁₂ -cycloalkyl or a group of the formula IX ##STR12## or R₁₈ and R₁₉, together with the nitrogen atom to which they are bonded, form a 5-membered or 6-membered heterocyclic ring, or R₁₆ is a group of the formula IXa ##STR13## in which Q is as defined above for B, n and m independently of one another are zero or 1, and A is methylene or a group --CH₂ --CH(R₂₀)-- or --CH₂ --C(E)(G)--, in which R₂₀ is hydrogen, methyl, ethyl, phenoxymethyl or phenyl, E is cyano or a group --C(O)OR₂₁, --C(O)R₂₂, --SO₂ R₂₂, --P(O)-- --(OR₂₃)₂, --C(O)NR₂₄ R₂₅ or --CHO, in which R₂₁ is C₁ -C₄ -alkyl, R₂₂ is C₁ -C₁₂ -alkyl, C₇ -C₁₄ -alkaryl or phenyl, R₂₃ is C₁ -C₁₈ -alkyl, phenyl or allyl, and R₂₄ and R₂₅ independently of one another are hydrogen, C₁ -C₁₈ -alkyl or phenyl, and G is hydrogen, C₁ -C₁₈ -alkyl, C₃ -C₁₂ -alkenyl, C₃ -C₄ -alkynyl, C₅ -C₁₂ -cycloalkyl, C₆ -C₁₈ -alkylcycloalkyl, C₆ -C₁₄ -cycloalkylalkyl, C₇ -C₁₄ -aralkyl, C₇ -C₁₉ -alkylaralkyl, phenyl, or C₁ -C₁₈ -alkyl which is substituted by phenoxy, C₇ -C₁₀ -alkylphenoxy, benzyloxy, cyclohexyloxy, cyano, --COOR₂₆, --OCOR₂₇ or --P(O)(OR₂₈)₂, R₂₆ being C₁ -C₁₈ -alkyl, C₃ -C₁₂ -cycloalkyl or a group of the formula VII, R₂₇ being C₁ -C₁₈ -alkyl, C₃ -C₁₂ -cycloalkyl, phenyl, C₇ -C₁₄ -aralkyl or a group of the formula III and R₂₈ being C₁ -C₁₈ -alkyl, allyl or phenyl, or G is C₂ -C₁₈ -alkyl interrupted by --O--, --S--, --SO-- or --SO₂ --, a group of the formula VII or a group of the formula ##STR14## in which R₂₉ and R₃₀ independently of one another are C₁ -C₄ -alkyl and R₃₀ additionally can also be hydrogen, or, if E is a group --C(O)R₂₂, G and R₂₂ together are trimethylene or tetramethylene.

C₁ -C₁₂ -Alkyl substituents which may be present can be branched or unbranched alkyl, for example methyl, ethyl, n-propyl, isopropyl, n-butyl, sec.-butyl, tert.-butyl, n-pentyl, n-hexyl, n-octyl, 1,1,3,3-tetramethylbutyl, n-nonyl, decyl or dodecyl. C₁ -C₄ -Alkyl is preferred. C₁ -C₁₈ -Alkyl radicals R₁₆ and R₂₃ can additionally be, for example, tridecyl, tetradecyl, hexadecyl or octadecyl.

C₁ -C₄ -Alkyl substituents which may be present are methyl, ethyl, n-propyl, isopropyl, n-butyl, sec.-butyl or tert.-butyl.

C₃ -C₁₂ -Alkenyl substituents which may be present are, for example, allyl, methallyl, 2-butenyl, 2-hexenyl, 2-octenyl, 4-octenyl, 2-decenyl or 2-dodecenyl. Allyl is preferred. C₂ -C₁₂ -Alkenyl substituents can additionally also be vinyl. In this case, vinyl and allyl are preferred.

C₃ -C₄ -Alkynyl radicals R₂, G and L are, for example, propargyl, n-but-1-ynyl or n-but-2-ynyl. Propargyl is preferred.

C₃ -C₁₁ -Alkoxyalkyl radicals R₂ and R₁₆ are, for example, ethoxymethyl, 2-methoxyethyl, 2-ethoxyethyl, 2-n-butoxyethyl, 2-n-butoxypropyl, 2-n-octoxyethyl, 3-n-octoxypropyl or 6-n-butoxyhexyl. Additionally, a C₂ -alkoxyalkyl radical R₂ can also be methoxymethyl.

Halogens X₁ and X₂ are, for example, bromine, iodine and in particular chlorine.

C₃ -C₁₂ -Cycloalkyl substituents which may be present are, for example, cyclopropyl, cyclopentyl, cyclohexyl, cycloheptyl, α-methylcyclohexyl, cyclooctyl, cyclononyl, cyclodecyl or cyclododecyl. Cyclohexyl is preferred.

C₇ -C₁₄ -Alkaryl substituents which may be present are, for example, phenyl substituted by C₁ -C₄ -alkyl, such as p-tolyl, 2,4-dimethylphenyl, 2,6-dimethylphenyl, 2,4-diethylphenyl, 2,6-diethylphenyl, 4-tert.-butylphenyl, 2,4-di-tert.-butylphenyl or 2,6-di-tert.-butylphenyl. 2,4-Di-tert.-butylphenyl and 2,4-dimethylphenyl are preferred.

5-Membered or 6-membered heterocyclic rings, formed by R₇ and R₈ or R₁₈ and R₁₉ together with the nitrogen atom to which they are bonded, are, for example, pyrrolidine, oxazolidine, piperidine or morpholine radicals.

C₇ -C₁₄ -Aralkyl substituents which may be present are, for example, benzyl, p-methylbenzyl, p-tert.-butylbenzyl, 1-phenylethyl, α,α-dimethylbenzyl or 2-phenylethyl.

In --C_(r) H_(2r) -- groups B, B₁ or Q, in which r is a number between 1 and 12, r preferably is a number between 2 and 8. Examples are methylene, ethylene, trimethylene, tetramethylene, hexamethylene, octamethylene, nonamethylene, 2,2,4-trimethylhexamethylene, decamethylene and dodecamethylene.

C₄ -C₈ -Alkenylene radicals B or Q are, for example, but-2-en-1,4-ylene.

C₄ -C₈ -Alkynylene radicals B or Q are, for example, but-2-yn-1,4-ylene.

C₅ -C₁₂ -Cycloalkylene radicals B and Q are, for example, cyclopentylene, cyclohexylene, cyclooctylene, cyclodecylene or cyclododecylene. Cyclohexylene is preferred.

C₁ -C₁₂ -Alkyl radicals G, substituted by phenoxy, benzyloxy, cyclohexyloxy or cyano, can, for example, be one of the following radicals: 2-phenoxyethyl, 2-benzyloxyethyl, cyclohexyloxymethyl, 2-cyanoethyl, cyanomethyl or 3-cyanopropyl.

C₆ -C₁₈ -Alkylcycloalkyl radicals G are, for example, methylcyclohexyl, ethylcyclohexyl, butylcyclohexyl, tert.-butylcyclohexyl, dodecylcyclohexyl, ethylcyclopentyl or butylcyclopentyl and C₆ -C₁₄ -cycloalkylalkyl radicals G are, for example, cyclohexylmethyl, cyclohexylethyl, cyclohexylbutyl, cyclohexylhexyl, cyclohexyloctyl, cyclopentylpropyl or cyclopentylhexyl.

C₁ -C₁₈ -Alkyl radicals G, substituted by C₇ -C₁₀ -alkylphenoxy, can be, for example, p-methylphenoxymethyl, p-methylphenoxyethyl, p-methylphenoxypropyl, p-tert.-butylphenoxymethyl, p-tert.-butylphenoxyethyl, 2,4-dimethylphenoxymethyl, 2,4-dimethylphenoxyethyl, 2,4-di-tert.-butylphenoxyethyl, 2,6-di-tert.-butylphenoxymethyl or 2,4,6-trimethylphenoxyethyl.

C₂ -C₁₂ -Alkyl radicals G interrupted by --O--, --S--, --SO-- or --SO₂ -- are, for example, one of the following radicals: methoxymethyl, 2-butoxyethyl, 2-octyloxyethyl, isopropoxymethyl, 3-butylthiopropyl, 2-decylthioethyl, 2-(isohexylsulfinyl)-ethyl, 2-(butylsulfonyl)-ethyl or 2-(ethylsulfonyl)-propyl.

If R₂ is a group of the formula V or of the formula VI, and if R₁₆ is or contains a group of the formula VII or of the formula IX, not more than two groups of the formula VII may be present in total in the compound of the formula I.

Those colour-photographic recording materials are preferred which contain, as the light stabiliser, at least one compound of the formula X ##STR15## in which R₁ is hydrogen or methyl, R₄ and R₅ independently of one another are C₁ -C₄ -alkyl and additionally R₄ can also be hydrogen or a group of the formula Xa ##STR16## in which M is a direct bond, --CH(D₂)-- or --S-- and D₂ is hydrogen or C₁ -C₈ -alkyl, A is methylene, ethylene or a group --CH₂ --C(E)(G)--, in which E is cyano, --COCH₃ or --COOCH₃ and G is hydrogen, C₁ -C₁₈ -alkyl, allyl, cyclohexyl, benzyl or one of the two groups of the formulae ##STR17## in which R₃₀ is methyl or tert.-butyl, or E and G together form a group --CO--(CH₂)₄ --, n and m are as defined above, R₂ is hydroxyl, C₁ -C₄ -alkyl, allyl, methallyl, propargyl, benzyl, 2-hydroxyethyl, C₂ -C₇ -alkoxyalkyl or a group of the formula --(CH₂)_(p) --CH(R₆)--X₁ or --CH(R₆)--X₂, in which p is one of the numbers 1, 2 or 3, X₁ is halogen, cyano, --OR₇, --OC(O)R₇, --OC(O)N(R₇)(R₈), --C(O)R₇ or --C(O)N(R₇)(R₈), X₂ is halogen, cyano, 1,2-epoxyethyl, --C(O)OR₇ or --C(O)N(R₇)(R₈) and R₆ is hydrogen, methyl or phenyl, R₇ being hydrogen, C₁ -C₈ -alkyl, vinyl, allyl, methallyl, C₅ -C₈ -cycloalkyl, phenyl or C₇ -C₁₀ -aralkyl and R₈ being hydrogen or methyl, or R₂ is a group of the formula II, in which L is hydrogen, C₁ -C₄ -alkyl, vinyl, allyl, cyclohexyl, phenyl, benzyl, chloromethyl or a group --OR₉, in which R₉ is C₁ -C₈ -alkyl, cyclohexyl, vinyl, allyl or methallyl, or L is a group of the formula III, in which m, A, R₄ and R₅ are as defined for these preferred compounds, and R₃ is hydrogen, or R₂ is a group of the formula IV, in which R₁₀ and R₁₁ independently of one another are C₁ -C₁₂ -alkyl, cyclohexyl or phenyl and R₁₁ additionally can also be hydrogen, or R₂ is a group of the formula XI ##STR18## in which n, R₄, R₅ and Y are as defined for these preferred compounds, A' is methylene or a group --CH₂ --CH(R₁₃)--, q is zero or 1, and R₁₂ and R₁₃ independently of one another are hydrogen or methyl, or R₂ is a group of the formula XII ##STR19## in which A, R₄, R₅, Y, n and m are as defined for these preferred compounds and B is a group --CH₂)_(r) or --CONH--CH₂)_(r) NHCO--, in which r is one of the numbers 2 to 8, or C₄ -C₈ -alkenylene, xylylene or bitolylene, or R₂ is one of the groups --SO₂ R₁₄ of --OR₁₅, in which R₁₄ is C₁ -C₄ -alkyl, p-tolyl or phenyl and R₁₅ is C₁ -C₄ -alkyl, benzyl or a group of the formula L'--CO--, in which L' is as already defined for L in these preferred compounds, and Y is --O-- or --N(R₁₆)--, in which R₁₆ is hydrogen, C₁ -C₁₂ -alkyl, cyclohexyl, C₃ -C₇ -alkoxyalkyl or a group of the formula XIII ##STR20## in which r, m, A, R₂, R₄ and R₅ are as already defined for these preferred compounds.

Those colour-photographic recording materials are particularly preferred which contain, as the light stabiliser, at least one compound of the formula XIV ##STR21## in which m is zero or 1, A is methylene or ethylene, R₄ and R₅ independently of one another are methyl or tert.-butyl, Y is --O-- or --N(R₁₆)--, in which R₁₆ is hydrogen or C₁ -C₈ -alkyl, and R₂ is hydroxyl, methyl, allyl, benzyl, 2-hydroxyethyl, acetyl, acryloyl, methoxy, acetoxy or a group of the formula XV ##STR22## in which m, A, R₄ and R₅ are as defined for these preferred compounds, or is a group of the formula IV, in which R₁₀ is C₁ -C₈ -alkyl, cyclohexyl or phenyl and R₁₁ is hydrogen, C₁ -C₈ -alkyl or cyclohexyl.

Those colour-photographic recording materials are also particularly preferred which contain, as the light stabiliser, at least one compound of the formula XIV, in which R₂ is a group of the formula ##STR23## and m, A, R₄, R₅ and Y are as defined in the last definition of preferred compounds, as well as those colour-photographic recording materials which contain, as the light stabiliser, at least one compound of the formula XIV, in which A is a group --CH₂ --C(E)(G)--, in which E is cyano, --COCH₃ or --COOCH₃ and G is hydrogen or one of the two groups of the formulae ##STR24## or E and G together form a group --CO--(CH₂)₄ --, R₂ is --CHO, acetyl or acryloyl and m, R₄, R₅ and Y are as defined in the last definition of preferred compounds.

Of particular interest are colour-photographic recording materials which contain, as the light stabiliser, at least one compound of the formula I, in which Y is --N(R₁₆)-- and n is the number 1. These compounds are novel and, as such, are also a subject of the present invention.

They can be prepared, according to methods known per se, by amidation of known 4-aminopiperidine compounds, approximately in accordance with the equation ##STR25## R₂, R₃, R₄, R₅, R₁₆, A and m being as defined above.

Also of interest are colour-photographic recording materials which contain, as the light stabiliser, at least one compound of the formula I, in which A is a group --CH₂ --C(E)(G)--, m and n are the number 1 and R₂ is --OH, --SO₂ R₁₄, --OR₁₅ or a group of the formulae V or VI. These compounds are also novel. They can likewise be prepared by methods known per se and according to the equation ##STR26## T being a group --N(R)₂, --SC(S)N(R)₂ or --OR, in which R is methyl or ethyl, R₂ being --OH, --SO₂ R₁₄, --OR₁₅ or a group of the formulae V or VI and R₁, R₃, R₄, R₅, E, G and Y being as defined above.

In a variant, it is possible in both cases to prepare the compounds mentioned by known reactions on the ring nitrogen of the compound of the formula ##STR27## for example by alkylation, acylation or addition.

The starting substances and the other compounds of the formula I are known. If some of these should still be novel, they can be prepared analogously to methods known per se.

Typical representatives of the compounds of the formula I are listed in Tables I to V which follow.

                                      TABLE 1                                      __________________________________________________________________________      ##STR28##                                                                     Light                                                                          stabiliser No.                                                                        Y                        R.sub.2                                        __________________________________________________________________________     1      NH                       CH.sub.3                                       2      NH                       COCH.sub.3                                     3      N(C.sub.4 H.sub.9)       COCH.sub.3                                     4      NH                       COCHCH.sub.2                                   5      N(C.sub.4 H.sub.9)       COCHCH.sub.2                                   6      O                        CH.sub.3                                       7      O                                                                                                        ##STR29##                                     8      O                        COCH.sub.3                                     9      O                         COCHCH.sub.2                                  10     O                        CH.sub.2CHCH.sub.2                             11     O                        CH.sub.2 CN                                    12                                                                                     ##STR30##               COCH.sub.3                                     13                                                                                     ##STR31##               COCHCH.sub.2                                   14     O                                                                                                        ##STR32##                                     15                                                                                     ##STR33##               CH.sub.3                                       16     O                        CH.sub.3COOCH.sub.3                            17     O                                                                                                        ##STR34##                                     18     O                        CH.sub.2 CH.sub.2 OH                           19     O                        CH.sub.2CCH                                    20     O                        CON(C.sub.2 H.sub.5).sub.2                     21     O                        OCH.sub.3                                      22     O                                                                                                        ##STR35##                                     23     O                                                                                                        ##STR36##                                     24     O                                                                                                        ##STR37##                                     25                                                                                     ##STR38##               COCHCH.sub.2                                   26                                                                                     ##STR39##               COCHCH.sub.2                                   27     O                                                                                                        ##STR40##                                     28     O                                                                                                        ##STR41##                                     29                                                                                     ##STR42##               CH.sub.3                                       __________________________________________________________________________

                  TABLE II                                                         ______________________________________                                          ##STR43##                                                                     Light                                                                          stabi-                                                                         liser                                                                          No.   R.sub.4   n     R.sub.2                                                  ______________________________________                                         30    H         2     COCHCH.sub.2                                             31    H         2     CH.sub.3                                                 32    CH.sub.3  2     CH.sub.3                                                 33    CH.sub.3  2     COCHCH.sub.2                                             34    CH.sub.3  2     COCH.sub.3                                               35    H         2     COCH.sub.3                                               36    C(CH.sub.3).sub.3                                                                        0                                                                                     ##STR44##                                               37    C(CH.sub.3).sub.3                                                                        0     COCHCH.sub.2                                             38    C(CH.sub.3).sub.3                                                                        1     COCHCH.sub.2                                             ______________________________________                                    

                                      TABLE III                                    __________________________________________________________________________      ##STR45##                                                                     Light                                                                          stabiliser                                                                     No.  E      G                  R.sub.2                                         __________________________________________________________________________     39   CN     H                  CHO                                             40   COCH.sub.3                                                                             ##STR46##         COCH.sub.3                                      41   COOCH.sub.3                                                                            ##STR47##         COCH.sub.3                                      42   CN                                                                                     ##STR48##         COCHCH.sub.2                                    43   CN                                                                                     ##STR49##         COCHCH.sub.2                                    44                                                                                   ##STR50##                COCHCH.sub.2                                    __________________________________________________________________________

                  TABLE IV                                                         ______________________________________                                          ##STR51##                                                                     Light stabiliser No.                                                                            M                                                             ______________________________________                                         45               S                                                             46               CH.sub.2                                                      47               direct bond                                                   ______________________________________                                    

                                      TABLE V                                      __________________________________________________________________________      ##STR52##                                                                     Light                                                                          stabiliser                                                                     No.  n R                   R.sub.2                                             __________________________________________________________________________     48   2                                                                                 ##STR53##          COCH.sub.3                                          49   3                                                                                 ##STR54##          COCHCH.sub.2                                        __________________________________________________________________________

The compounds of the formula I are scarcely soluble in water and, for this reason, they are dissolved in a low-boiling organic solvent, such as methyl acetate, ethyl acetate, carbon tetrachloride, chloroform, methanol, ethanol, n-butanol, dioxane, acetone or benzene, in a high-boiling organic solvent, such as tricresyl phosphate, dimethylformamide, dimethyl sulfoxide, di-n-butyl phthalate or ethyl N-diphenylcarbamate, or in a solvent mixture consisting of the abovementioned low-boiling and high-boiling organic solvents, the solution obtained is added to a protective colloid solution, such as especially an aqueous gelatine solution, and the mixture is dispersed by means of a colloid mill, a homogeniser or by applying ultrasonics.

The dispersions thus obtained are then used for the preparation of the layers of colour-photographic recording materials. These layers can, for example, be interlayers or protective layers, but especially light-sensitive (for example blue-sensitive, green-sensitive and red-sensitive) silver halide emulsion layers in which, when the exposed recording material is developed, cyan dyes, magenta dyes and yellow dyes are formed from the corresponding colour couplers.

If desired, the light stabiliser can also be applied in the treatment baths which are used after colour development, for example in fixing baths and/or washing baths, but a certain solubility of the compounds of the formula I in alcohols (methanol/ethanol), aqueous alkali and/or water is necessary in that case. If the diffusion transfer method is used, the light stabiliser can be incorporated not only into the customary photographic emulsion layers, but also into a receiving layer.

It is possible to employ any desired cyan couplers, magenta couplers and yellow couplers, which are used for the formation of the said dyes and hence the colour images. They can be dissolved, for example, in an alkaline solution or in a high-boiling organic solvent, these solutions then being dispersed in an aqueous gelatin solution and being incorporated into a photographic silver halide emulsion. They can also be added to colour-photographic developers.

In the photographic recording material according to the present invention, the light stabilisers according to formula I can be combined in the same layer not only with the colour couplers, but additionally also with ultraviolet absorbers.

The silver halide emulsions preferably contain gelatine as the binder, if appropriate as a mixture with other high-molecular natural or synthetic compounds.

The silver halide emulsions can, for example, be silver bromide emulsions, silver chloride emulsions or silver iodide emulsions, or they can also be those emulsions which contain a mixture of silver halides, for example silver bromide/iodide emulsions or silver chloride/bromide emulsions.

The emulsions can be sensitised chemically, and they can also contain customary organic stabilisers and anti-fogging agents as well as customary plasticisers, for example glycerol. The emulsions can also be hardened with the hardeners customary for gelatine. Moreover, the emulsions can contain customary coating assistants. The emulsions can be applied to customary bases for photographic recording material.

To develop the colour-photographic recording material, the customary developer baths can be used. As a rule, these contain a developer substance of the p-phenylenediamine type, a development retarder, such as potassium bromide, an antioxidant, such as sodium sulfite, and a base, for example an alkali metal hydroxide or alkali metal carbonate. The developing baths can also contain a customary anti-fogging agent and complexing agents.

The light stabilisers to be used according to the invention are in certain cases also suitable for protecting colour-photographic layers, in which the dyes are incorporated directly into the emulsion and the image is produced by selective bleaching.

The quantity of light stabiliser, if appropriate in combination with a customary ultraviolet absorber, can vary within wide limits and is approximately within the range from 1 to 2,000 mg, preferably 1 to 800 and in particular 400 mg, per m² of the layer into which it is (or they are) incorporated.

If the photographic material contains an agent which absorbs UV light, this agent can be present in the same layer or in the adjacent layer.

The ultraviolet absorber can be present in one layer, together with the light stabiliser, or in an adjacent layer. The weight ratio between a customary ultraviolet absorber and the light stabiliser of the formula I is about (5-10):1, and the molar ratio is about (10-20):1. Examples of ultraviolet absorbers are compounds of the benzophenone, acrylonitrile, thiazolidone, benzotriazole, oxazole, thiazole and imidazole type.

The colour images obtained with the recording material according to the invention by exposure and development display very good lightfastness to visible and ultraviolet light. The compounds of the formula I are virtually colourless, so that there is no discolouration of the images: additionally, they are well compatible with the customary photographic additives present in the individual layers; due to their high effectiveness, the quantity in which they are used can be reduced, and they are thus prevented from precipitating or crystallising out, when the are incorporated as an organic solution into the aqueous binder emulsions which are used for the preparation of photographic layers. The individual processing steps, necessary after the exposure of the photographic recording material, for the production of the colour images are not adversely affected by the light stabilisers. Moreover, the formation of so-called abrasion fog, which frequently occurs in the case of blue-sensitive emulsions, can be largely suppressed. This abrasion fog can, for example, occur if mechanical stresses, for example turning, bending or rubbing, are exerted on photographic materials (silver halide emulsion layers present on a base of natural or synthetic materials) during manufacture or during treatment before development (T. H. James, The Theory of the Photographic Process, 4th edition, Macmillan, New York, N.Y. 1977, pages 23 et seq. and pages 166 et seq.).

The examples which follow explain the present invention, without restricting it.

Preparation Examples

EXAMPLE 1

4.1 g of 2,2,6,6-tetramethylpiperidinyl-4-β-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionamide, 2.8 g of methyl iodide and 6.5 g of anhydrous potassium carbonate are heated under reflux in 100 ml of acetone for four hours. The acetone is evaporated off and the residue is dissolved in 150 ml of ether, washed with water and dried. After evaporation of the solvent, a yellow oil which crystallises from acetonitrile is obtained. This gives 2.6 g (60%) of 1,2,2,6,6-pentamethylpiperidinyl-4-β-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionamide as colourless crystals having a melting point of 132°-134° C. (light stabiliser 1).

EXAMPLE 2

4.1 g of 2,2,6,6-tetramethylpiperidinyl-4-β-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionamide are stirred at 90° C. in 80 ml of acetic anhydride for twelve hours. The solvent is evaporated off in vacuo, and the residue is dissolved in 50 ml of methanol and the solution is slowly added dropwise to 150 ml of 10% sodium chloride solution. The solid is filtered off with suction, dried at 50° C. and dissolved in 50 ml of acetone. The acetone solution is clarified by filtration, diluted with 150 ml of ether and cooled to 0° C., and the precipitate obtained is filtered off with suction. This gives 3.1 g (69%) of 1-acetyl-2,2,6,6-tetramethylpiperidinyl-4-β-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionamide as colourless crystals having a melting point of 130°-132° C. (light stabiliser 2).

EXAMPLE 3

4.7 g of 2,2,6,6-tetramethylpiperidinyl-4-β-(3,5-di-tert.-butyl-4-hydroxyphenyl)-N-butyl-propionamide are stirred at 90° C. in 80 ml of acetic anhydride for twelve hours. The solvent is evaporated off in vacuo, and the orange-coloured oil is heated in 60 ml of petroleum ether at 50° C. for ten minutes. The precipitate is filtered off with suction, washed with petroleum ether and dried at 50° C. This gives 3.5 g (68%) of 1-acetyl-2,2,6,6-tetramethylpiperidinyl-4-β-(3,5-di-tert.-butyl-4-hydroxyphenyl)-N-butyl-propionamide as a colourless powder having a melting point of 133°-135° C. (light stabiliser 3).

EXAMPLE 4

4.1 g of 2,2,6,6-tetramethylpiperidinyl-4-β-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionamide are dissolved in 150 ml of acetonitrile. 1.5 g of triethylamine are added and the solution is warmed to 60° C. 1.0 g of acrylic acid chloride is added dropwise and the mixture is stirred for one further hour after the addition. The reaction mixture is filtered and the filtrate is evaporated. After purification by column chromatography, 2.0 g of 1-acryloyl-2,2,6,6-tetramethylpiperidinyl-4-β-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionamide having a melting point of 149° to 151° C. are obtained (light stabiliser 4).

EXAMPLE 5

The procedure described in Example 4 is repeated, using the corresponding amount of 2,2,6,6-tetramethylpiperidinyl-4-β-(3,5-di-tert.-butyl-4-hydroxyphenyl)-N-butylpropionamide. 1-Acryloyl-2,2,6,6-tetramethylpiperidinyl-4-β-(3,5-di-tert.-butyl-4-hydroxyphenyl)-N-butylpropionamide having a melting point of 148° to 149° C. is obtained (light stabiliser 5).

EXAMPLE 6

10.8 g of 2,2,6,6-tetramethyl-4-piperidinyl cyanoacetate and 35 g of 2,6-di-tert.-butyl-4-hydroxybenzyl N,N-diethyl-dithiocarbamate are introduced into 150 ml of isopropanol and the mixture is heated to 50° C. At this temperature, a solution of 3.8 g of sodium hydroxide in 20 ml of water is added dropwise in the course of 30 minutes. The light-brown solution is further stirred at 50°-60° C. and then refluxed for 1.5 hours. The green solution is cooled to room temperature, 200 ml of water are added and the solution is then cooled to 5° C. The light-yellow product which has precipitated is filtered off with suction, washed with cold isopropanol (aqueous) and dried. Melting point 174° C. This product is then reacted, as described in Example 4, with acryloyl chloride to give 1-acryloyl-2,2,6,6-tetramethylpiperidin-4-yl α-(3,5-di-tert.-butyl-4-hydroxybenzyl)-α-cyano-β-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionate. Melting point 188°-190° C. (Light stabiliser No. 42 ).

Application Examples

EXAMPLE 7a AND b

0.087 g of the yellow coupler of the formula ##STR55## and 0.026 g of one of the light stabilisers indicated in the tables which follow are dissolved in 2.0 ml of a mixture of tricresyl phosphate and ethyl acetate (1.5 g in 100 ml). To this solution, 7.0 ml of a 6% gelatine solution, 0.5 ml of an 8% solution of the wetting agent of the formula ##STR56## in (3:4) isopropanol/water and 0.5 ml of water are added, and the whole is emulsified ultrasonically for 5 minutes at a power of 100 watt.

2.0 ml of a silver bromide emulsion having a silver content of 6.0 g per liter, 0.7 ml of a 1% aqueous solution of the hardener of the formula ##STR57## and 3.8 ml of water are added to 2.5 ml of the emulsion thus obtained, and the mixture is adjusted to a pH value of 6.5 and coated onto subbed, plastic-coated, white paper mounted on a glass plate.

After solidification, the paper is dried at room temperature in a circulating-air oven.

After 3 days, samples cut to 35×180 mm are exposed behind a step wedge at 3,000 lux×seconds and then processed by the Kodak Ektaprint 2.sup.® process.

(a) One part of the yellow wedges thus obtained is irradiated in an Atlas Weather-O-meter with a 2,500 W xenon lamp behind a UV filter (Kodak 2C) with 63 KJoule/cm² and a second part is irradiated with 168 KJoule/cm² (one further comparative sample of each does not contain any light stabiliser).

The table shows the percentage decrease in density, the original density being 1.0:

    ______________________________________                                         With UV filter                                                                                Density loss at 440 nm in percent                               Light stabiliser                                                                              (D = 1.0), quantity of light                                    No.            63 KJ/cm.sup.2                                                                           168 KJ/cm.sup.2                                       ______________________________________                                         --             13        28                                                     9             5         13                                                    27             5         15                                                    28             5         12                                                    29             5         13                                                    36             5         13                                                    ______________________________________                                    

(b) A part of the yellow wedges obtained is irradiated as described under (a) but without a UV filter, with 21 KJoule/cm² and a further part is irradiated, likewise without a UV filter, with 63 KJoule/cm² (one further comparative sample of each does not contain any light stabiliser).

The table shows the percentage decrease in density, the original density being 1.0:

    ______________________________________                                         Without UV filter                                                                             Density loss at 440 nm in percent                               Light stabiliser                                                                              (D = 1.0), quantity of light                                    No.            21 KJ/cm.sup.2                                                                           63 KJ/cm.sup.2                                        ______________________________________                                         --             14        37                                                     4             3         16                                                    36             5         15                                                    ______________________________________                                    

EXAMPLE 8

0.025 g of the cyan coupler of the formula ##STR58## and 0.025 g of a light stabiliser from the table which follows are dissolved in 1 ml of a mixture of tricresyl phosphate and ethyl acetate (1.5 g in 100 ml). To this solution, 7.0 ml of a 6% gelatine solution, 0.5 ml of an 8% solution of the wetting agent of the formula ##STR59## in (3:4) isopropanol/water and 0.5 ml of water are added, and the whole is emulsified ultrasonically for 5 minutes at a power of 100 watt.

2.0 ml of a silver bromide emulsion having a silver content of 6.0 g per liter, 0.7 ml of a 1% aqueous solution of the hardener of the formula ##STR60## and 3.8 ml of water are added to 2.5 ml of the emulsion thus obtained, and the mixture is adjusted to a pH value of 6.5 and coated onto subbed, plastic-coated, white paper mounted on a glass plate.

After solidification, the paper is dried at room temperature in a circulating-air oven.

Analogously to the procedure described in Example 7a and b, layers are prepared, exposed and processed.

The wedges obtained are stored in an air-conditioned cabinet at 60° C. and 70% relative humidity. The table which follows shows the percentage decrease in the cyan density, the original density being 1.0 in the red (measured by means of a Densitometer.sup.® TR 924 Status A, from Messrs. Macbeth).

    ______________________________________                                                          Density loss in the red in percent                                             (D = 1.0, 60° C./70% relative                          Light stabiliser humidity                                                      No.              14 days 28 days                                               ______________________________________                                         --               32      46                                                    36               15      25                                                    40               16      26                                                    ______________________________________                                     

What is claimed is:
 1. A colour-photographic recording material which, in at least one light-sensitive silver halide emulsion layer, an interlayer and/or a protective layer, contains a light stabilising amount of at least one polyalkylpiperidine compound as a light stabiliser, wherein the polyalkylpiperidine compound is of the formula I ##STR61## in which R₁ and R₃ independently of one another are hydrogen or methyl, R₂ is hydroxyl, C₁ -C₁₂ -alkyl, C₃ -C₁₂ -alkenyl, C₃ -C₄ -alkynyl, 2-hydroxyethyl, C₂ -C₁₁ -alkoxyalkyl, C₇ -C₁₄ -aralkyl or a group of the formula --(CH₂)_(p) --CH(R₆)--X₁ or --CH(R₆)--X₂, in which p is one of the numbers 1, 2 or 3, X₁ is halogen, cyano, --OR₇, --OC(O)R₇, --OC(O)N(R₇)(R₈), --C(O)OR₇ or --C(O)N(R₇)(R₈), X₂ is halogen, cyano, 1,2-epoxyethyl, --C(O)OR₇ or --C(O)N(R₇)(R₈) and R₆ is hydrogen, methyl or phenyl, R₇ being hydrogen, C₁ -C₁₂ -alkyl, C₂ -C₁₂ -alkenyl, C₃ -C₁₂ -cycloalkyl, phenyl, C₇ -C₁₄ -alkaryl or C₇ -C₁₄ -aralkyl and R₈ being hydrogen or C₁ -C₄ -alkyl, or R₇ and R₈, together with the nitrogen atom to which they are bonded, forming a 5-membered or 6-membered heterocyclic ring, or R₂ is a group of the formula II

    L--CO--                                                    (II)

in which L is hydrogen, C₁ --C₁₂ -alkyl, C₂ --C₁₂ -alkenyl, C₃ -C₄ -alkynyl, C₃ -C₁₂ -cycloalkyl, C₇ -C₁₄ -alkaryl, C₇ -C₁₄ -aralkyl, chloromethyl, unsubstituted phenyl, phenyl which is substituted by two C₁ -C₄ -alkyls and one hydroxyl, or a group --OR₉, in which R₉ is C₁ -C₁₂ -alkyl, cyclohexyl, C₂ -C₁₂ -alkenyl, benzyl or phenyl, or L is a group of the formula III ##STR62## or R₂ is a group of the formula IV ##STR63## in which R₁₀ and R₁₁ independently of one another are C₁ -C₁₂ -alkyl, C₃ -C₁₂ -alkenyl, C₃ -C₁₂ -cycloalkyl, phenyl, C₇ -C₁₄ -alkaryl or C₇ -C₁₄ -aralkyl and R₁₁ additionally can also be hydrogen, or R₂ is a group of the formula V ##STR64## in which A' is methylene or a group --CH₂ --CH(R₁₃)-- and q is zero or 1, and R₁₂ and R₁₃ independently of one another are hydrogen, methyl, ethyl, phenoxymethyl or phenyl, or R₂ is a group of the formula VI ##STR65## in which B is a group C_(r) H_(2r), in which r is a number from 2 to 12, or is C₄ -C₈ -alkenylene, C₄ -C₈ -alkynylene, phenylene, xylylene, bitolylene, C₅ -C₁₂ -cycloalkylene or a group --CONH--B₁ --NHCO--, in which B₁ is a group C_(r) H_(2r), phenylene, naphthylene, tolylene or a group of the formulae ##STR66## in which R' is hydrogen, methyl or ethyl, R" is hydrogen or methyl and r is as defined above, or R₂ is one of the groups --S(O)_(z) R₁₄ or --OR₁₅, in which z is the number 1 or 2, R₁₄ is C₁ -C₁₂ -alkyl, C₇ -C₁₄ -alkaryl or phenyl and R₁₅ is C₁ -C₁₂ -alkyl, C₃ -C₁₂ -alkenyl, C₇ -C₁₄ -aralkyl or a group of the formula L'--CO--, in which L' is as defined above for L, R₄ and R₅ independently of one another are C₁ -C₁₂ -alkyl, C₃ -C₁₂ -cycloalkyl, C₇ -C₁₄ -aralkyl, C₇ -C₁₄ alkaryl or phenyl and R₄ can additionally also be hydrogen or a group of the formula Ia ##STR67## in which R₁, R₂, R₃, R₅, A, Y, m and n are as defined herein and M is a direct bond, ##STR68## and D₁ and D₂ independently of one another are hydrogen, C₁ -C₁₈ -alkyl, alkyl interrupted by 1 to 3 --S-- or phenyl, or D₁ and D₂, together with the C atom linking them, form a 5-membered or 6-membered aliphatic ring and D₃ is hydrogen, C₁ -C₁₈ -alkyl or phenyl, Y is --O-- or --N(R₁₆)--, in which R₁₆ is hydrogen, C₁ -C₁₈ -alkyl, C₃ -C₁₂ -alkenyl, C₃ -C₁₂ -cycloalkyl, phenyl, C₇ -C₁₄ -alkaryl, C₇ -C₁₄ -aralkyl, C₃ -C₁₁ -alkoxyalkyl, a group of the formula VII ##STR69## or a group --Z--D, in which Z is a --(CH₂)_(s) group unsubstituted or substituted by a methyl group, s being one of the numbers 2 to 4 and D being hydroxyl, --OR₇ or --N(R₁₈)(R₁₉), in which R₁₇ and R₁₈ are hydrogen, C₁ -C₁₂ -alkyl, C₃ -C₁₂ -cycloalkyl or a group of the formula VIII ##STR70## and R₁₇ additionally can also be a group of the formula VII, R₁₉ is hydrogen, C₁ -C₁₂ -alkyl, C₃ -C₁₂ -cycloalkyl or a group of the formula IX ##STR71## or R₁₈ and R₁₉, together with the nitrogen atom to which they are bonded, form a 5-membered or 6-membered heterocyclic ring, or R₁₆ is a group of the formula IXa ##STR72## in which Q is as defined above for B, n and m independently of one another are zero or 1, and A is methylene or a group --CH₂ --CH(R₂₀)-- or --CH₂ --C(E)(G)--, in which R₂₀ is hydrogen, methyl, ethyl, phenoxymethyl or phenyl, E is cyano or a group --C(O)OR₂₁, --C(O)R₂₂, --SO₂ R₂₂, --P(O)-- --(OR₂₃)₂, --C(O)NR₂₄ R₂₅ or --CHO, in which R₂₁ is C₁ -C₄ -alkyl, R₂₂ is C₁ -C₁₂ -alkyl, C₇ -C₁₄ -alkaryl or phenyl, R₂₃ is C₁ -C₁₈ -alkyl, phenyl or allyl, and R₂₄ and R₂₅ independently of one another are hydrogen, C₁ -C₁₈ -alkyl or phenyl, and G is hydrogen, C₁ -C₁₈ -alkyl, C₃ -C₁₂ -alkenyl, C₃ -C₄ -alkynyl, C₅ -C₁₂ -cycloalkyl, C₆ -C₁₈ -alkylcycloalkyl, C₆ -C₁₄ -cycloalkylalkyl, C₇ -C₁₄ -aralkyl, C₇ -C₁₉ -alkylaralkyl, phenyl, or C₁ -C₁₈ -alkyl which is substituted by phenoxy, C₇ -C₁₀ -alkylphenoxy, benzyloxy, cyclohexyloxy, cyano, --COOR₂₆, --OCOR₂₇ or --P(O)(OR₂₈)₂, R₂₆ being C₁ -C₁₈ -alkyl or C₃ -C₁₂ -cycloalkyl, R₂₇ being C₁ -C₁₈ -alkyl, C₃ -C₁₂ -cycloalkyl, phenyl, C₇ -C₁₄ -aralkyl or a group of the formula III and R₂₈ being C₁ -C₁₈ -alkyl, allyl or phenyl, or G is C₂ -C₁₈ -alkyl interrupted by --O--, --S--, --SO-- or --SO₂ -- or a group of the formula ##STR73## in which R₂₉ and R₃₀ independently of one another are C₁ -C₄ -alkyl and R₃₀ additionally can also be hydrogen, or, if E is a group --C(O)R₂₂, G and R₂₂ together are trimethylene or tetramethylene.
 2. A colour-photographic recording material according to claim 1, which contains as the light stabiliser, at least one polyalkylpiperidine compound of the formula X ##STR74## in which R₁ is hydrogen or methyl, R₄ and R₅ independently of one another are C₁ -C₄ -alkyl and additionally R₄ can also be hydrogen or a group of the formula Xa ##STR75## in which M is a direct bond, --CH(D₂)-- or --S-- and D₂ is hydrogen or C₁ -C₈ -alkyl, A is methylene, ethylene or a group --CH₂ --C(E)(G)--, in which E is cyano, --COCH₃ or --COOCH₃ and G is hydrogen, C₁ -C₁₈ -alkyl, allyl, cyclohexyl, benzyl or a group of the formula ##STR76## in which R₃₀ is methyl or tert.-butyl, or E and G together form a group --CO--(CH₂)₄ --, n and m are as defined in claim 1, R₂ is hydroxyl, C₁ -C₄ -alkyl, allyl, methallyl, propargyl, benzyl, 2-hydroxyethyl, C₂ -C₇ -alkoxyalkyl or a group of the formula --(CH₂)_(p) --CH(R₆)--X₁ or --CH(R₆)--X₂, in which p is one of the numbers 1, 2 or 3, X₁ is halogen, cyano, --OR₇, --OC(O)R₇, --OC(O)N(R₇)(R₈), --C(O)R₇ or --C(O)N(R₇)(R₈), X₂ is halogen, cyano, 1,2-epoxyethyl, --C(O)OR₇ or --C(O)N(R₇)(R₈) and R₆ is hydrogen, methyl or phenyl, R₇ being hydrogen, C₁ -C₈ -alkyl, vinyl, allyl, methallyl, C₅ -C₈ -cycloalkyl, phenyl or C₇ -C₁₀ -aralkyl and R₈ being hydrogen or methyl, or R.sub. 2 is a group of the formula II in claim 1, in which L is hydrogen, C₁ -C₄ -alkyl, vinyl, allyl, cyclohexyl, phenyl, benzyl, chloromethyl or a group --OR₉, in which R₉ is C₁ -C₈ -alkyl, cyclohexyl, vinyl, allyl or methallyl, or L is a group of the formula III in claim 1, in which m, A, R₄ and R₅ are as defined in this claim, and R₃ is hydrogen, or R₂ is a group of the formula IV in claim 1, in which R₁₀ and R₁₁ independently of one another are C₁ -C₁₂ -alkyl, cyclohexyl or phenyl and R₁₁ additionally can also be hydrogen, or R₂ is a group of the formula XI ##STR77## in which n, R₄, R₅ and Y are as defined in this claim, A' is methylene or a group --CH₂ --CH(R₁₃)--, q is zero or 1, and R₁₂ and R₁₃ independently of one another are hydrogen or methyl, or R₂ is a group of the formula XII ##STR78## in which A, R₄, R₅, Y, n and m are as defined in this claim and B is a group --CH₂)_(r) or --CONH--CH₂)_(r) NHCO--, in which r is one of the numbers 2 to 8, or C₄ -C₈ -alkenylene, xylylene or bitolylene, or R₂ is one of the groups --SO₂ R₁₄ or --OR₁₅, in which R₁₄ is C₁ -C₄ -alkyl, p-tolyl or phenyl and R₁₅ is C₁ -C₄ -alkyl, benzyl or a group of the formula L'--CO--, in which L' is as previously defined for L in this claim, and Y is --O-- or --N(R₁₆)--, in which R₁₆ is hydrogen, C₁ -C₁₂ -alkyl, cyclohexyl, C₃ -C₇ -alkoxyalkyl or a group of the formula XIII ##STR79## in which r, m, A, R₂, R₄ and R₅ are as previously defined in this claim.
 3. A colour-photographic recording material according to claim 1, which contains, as the light stabiliser, at least one polyalkylpiperidine compound of the formula XIV ##STR80## in which m is zero or 1, A is methylene or ethylene, R₄ and R₅ independently of one another are methyl or tert.-butyl, Y is --O-- or --N(R₁₆)--, in which R₁₆ is hydrogen or C₁ -C₈ -alkyl, and R₂ is hydroxyl, methyl, allyl, benzyl, 2-hydroxyethyl, acetyl, acryloyl, methoxy, acetoxy or a group of the formula XV ##STR81## in which m, A, R₄ and R₅ are as defined in this claim, or is a group of the formula IV of claim 1, in which R₁₀ is C₁ -C₈ -alkyl, cyclohexyl or phenyl and R₁₁ is hydrogen, C₁ -C₈ -alkyl or cyclohexyl.
 4. A colour photographic recording material according to claim 1, which contains, as the light stabiliser, at least one polyalkylpiperidine compound of the formula XIV ##STR82## in which R₂ is a group of the formula ##STR83## m is 0 or 1, A is methylene or ethylene, R₄ and R₅ independently of one another are methyl or tert.-butyl, and Y is --O-- or --N(R₁₆)--, in which R₁₆ is hydrogen or C₁ -C₈ -alkyl.
 5. A colour-photographic recording material according to claim 1, which contains, as the light stabiliser, at least one polyalkylpiperidine compound of the formula XIV ##STR84## in which A is a group --CH₂ --C(E)(G)--, in which E is cyano, --COCH₃ or --COOCH₃ and G is hydrogen or a group of the formula ##STR85## or E and G together form a group --CO--(CH₂)₄ --, R₂ is --CHO, acetyl or acryloyl, m is 0 or 1, R₄ and R₅ independently of one another are methyl or tert.-butyl, and Y is --O-- or --N(R₁₆)--, in which R₁₆ is hydrogen or C₁ -C₈ -alkyl.
 6. A colour-photographic recording material according to claim 1, which contains, as the light stabiliser, the polyalkylpiperidine compound of the formula ##STR86##
 7. A colour-photographic recording material according to claim 1, which contains, as the light stabiliser, the polyalkylpiperidine compound of the formula ##STR87##
 8. A colour-photographic recording material according to claim 1, which contains, as the light stabiliser, the polyalkylpiperidine compound of the formula ##STR88##
 9. A colour-photographic recording material according to claim 1, which contains, as the light stabiliser, the polyalkylpiperidine compound of the formula ##STR89## 